Remove deprecated string features.

utils/tests/peg/peg_test.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library peg_tests;
 import '../../peg/pegparser.dart';
 
 testParens() {
   Grammar g = new Grammar();
   Symbol a = g['A'];
@@ skipping 50 matching lines @@
 
   // Without the lexical context, TEXT will grab intervening whitespace.
   check(g, TEXT(MANY(OR(['1','a']))), '  1a1  ', '1a1');
   check(g, TEXT(MANY(OR(['1','a']))), '  1  a 1  ', '1  a 1');
 
   // Custom processing of the TEXT substring.
   var binaryNumber =
       TEXT(LEX(MANY(OR(['0','1']))),
            (str, start, end) {
              var r = 0;
-             var zero = '0'.charCodeAt(0);
+             var zero = '0'.codeUnitAt(0);
              for (int i = start; i < end; i++)
-               r = r * 2 + (str.charCodeAt(i) - zero);
+               r = r * 2 + (str.codeUnitAt(i) - zero);
              return r;
            });
 
   check(g, binaryNumber, ' 10101 ', 21);
   check(g, binaryNumber, '1010111', 87);
   check(g, binaryNumber, '1010 111', null);
 }
 
 testOR() {
   // OR matches the first match.
@@ skipping 254 matching lines @@
 }
 
 main() {
   testCODE();
   testParens();
   testOR();
   testTEXT();
   testBlockComment();
   testC();
 }